Product Details Converts stock piston-type bladder into a conversion-style bladder Resists fading, decreases moving parts and lowers friction for a smoother ride Product Videos Custom Field Product Reviews Write a Review Write a Review × Race Tech Race Tech SMBK Y4001 - Bladder Conversion Kit - 40 mm Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *